Be sure to check out the Peabody Museum Store!
Steve Spangler Science
Edmund Scientific's
Ward's Natural Science (Earth Science)

Yale University Science for the Community
Yale Science and Technology
Public Schools and Youth, Office of New Haven and Public Affairs
including:  Public Schools Partnerships, e.g. Science Education Outreach
Yale-New Haven Teachers Institute
MacMillan Center (International and Area Studies)
including: Programs in International Educational Resources
Peabody Museum educational programs
including:  After school programs, Teacher Workshops and programs for adults

Teacher's Domain (WGBH Boston)
Earth Observatory (NASA), Carbon Cycle 
Bay Model Visitor Center
Earthscape
National Geographic
Metasequouia--a living fossil
PBS
American Association for the Advancement of Science
BBC Science
Improbable Research
Nasa Earth Observatory
ESphere Evironmental Science

Fuel Economy.gov (EPA and DOE)
Federation of American Scientists
Greenhouse Accounting (supported by Australian National University)

US Global Change Research Program
DOE's, Energy Efficiency and Renewable Energy, Guide for Consumers
EPA main web site--clean air to clean water
A Complete Idiot's Guide to Global Warming
Green Living for Dummies

Recycling

Incentives

Wind Power

Solar Power

Suppliers

CNN's Young People Who Rock  (see Tyler Lyson interview)
Marmarth Research Foundation (dino hunting--minium age 14 w/ adult+fees)
Objectif Sciences (science summer camps, etc.)

Charity Watch
Charity Navigator
Earthwatch
Nature Conservancy
Arbor Day